import { pino } from "pino";
import fs from "fs";
import path from "path";
// Determine if we're in a browser environment
const isBrowser =
typeof globalThis !== "undefined" &&
typeof (globalThis as any).window !== "undefined" &&
typeof (globalThis as any).window.localStorage !== "undefined";
// We're now always using the custom destination regardless of transport type
// to ensure no logs go to stdout/stderr
// Create log directory if it doesn't exist
const logDir = path.join(process.cwd(), "logs");
if (!isBrowser && !fs.existsSync(logDir)) {
try {
fs.mkdirSync(logDir, { recursive: true });
} catch (e) {
// Silent fail if directory creation fails
}
}
// Define log file path
const logFilePath = path.join(logDir, "mcp-whatsapp.log");
// Custom destination that writes to file or localStorage
const customDestination = {
write: (msg: string) => {
if (isBrowser) {
// In browser, use localStorage with rotation to prevent overflow
try {
const storage = (globalThis as any).window.localStorage;
const key = "mcp_whatsapp_log";
const existingLog = storage.getItem(key) || "";
// Keep only last 100KB to prevent localStorage overflow
const maxSize = 100 * 1024;
const newLog =
existingLog.length > maxSize
? existingLog.substring(existingLog.length - maxSize / 2) + msg
: existingLog + msg;
storage.setItem(key, newLog);
} catch (e) {
// Silent fail if localStorage is not available
}
} else {
// In Node.js, write to file
try {
fs.appendFileSync(logFilePath, msg);
} catch (e) {
// Silent fail if file write fails
}
}
return true;
},
};
// Configure pino logger
export const log = pino(
{
level: process.env.LOG_LEVEL || "info",
},
// Pass the custom destination as the second parameter
customDestination,
);
// Add a method to retrieve logs (useful for debugging)
export const getLogs = (): string => {
if (isBrowser) {
return (
(globalThis as any).window.localStorage.getItem("mcp_whatsapp_log") || ""
);
} else {
try {
return fs.existsSync(logFilePath)
? fs.readFileSync(logFilePath, "utf8")
: "";
} catch (e) {
return "";
}
}
};
// Example usage:
// log.info('This is an info message');
// log.warn('This is a warning');
// log.error(new Error('Something went wrong'), 'Error details');
// log.debug({ data: { key: 'value' } }, 'Debugging data');
// log.verbose('Verbose message', JSON.stringify({ complex: { nested: true } }));
